Definitions

life-threatening

[lahyf-thret-ning, -thret-n-ing] / ˈlaɪfˌθrɛt nɪŋ, -ˌθrɛt n ɪŋ /

ADJECTIVE

very dangerous

Synonyms

STRONGEST

deadly lethal mortal serious severe

WEAK

capital critical hazardous threatening touch and go unsafe

Antonyms

STRONGEST

harmless invigorating

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Though many who are infected make a full recovery, young children, elderly people, pregnant women and people with existing conditions or a weakened immune system can experience severe symptoms and suffer potentially life-threatening complications.

From BBC

People with life-threatening injuries may be more likely to survive when advanced medical care reaches them by helicopter.

From Science Daily

It's a rare and potentially life-threatening condition when twins share one placenta.

From BBC

"That leak of calcium explains why some patients experience muscle pain or, in extreme cases, life-threatening complications."

From Science Daily

A stroke is a life-threatening medical condition which happens when blood stops flowing to a part of your brain.

From BBC